Improved method of making caeriage-bolts



@uiten tatrs getraut @ffice SAMUEL FRSBIE AND ANDREW S. UPSON, OF FARMINGTON, CONNECTICUT.

i Letters Patent No. 69,333, dated October 1, 1867.

IMPROVBD METHOD OF MAKING CARRIAGE-BONES.

To ALL' WHoM rr MAY coNcEnN:

Be it known that we, SAMUEL Fnrsnrn, of FarmingtonConnecticut, and ANDREW S. UrsoN, of Farmington, Connecticut, have invented a new and useful Method of Making Bolts with Square Necks, and that the following, taken in connection with the drawings, is a full, clear, and exact description thereof. In the drawings- Figure 1 is a plan or top view of a machine in which our process may be worked,

Figure 2 is an end elevation thereof.

Figure 3 are views in perspective of dies and headers as if made of transparent material.

Figure 4 is an elevation of a completed or nished bolt, and

Figure 5 is an elevation of the preliminary form into which the rod is struck.

Our invention has for its object the making of headed bolts with square necks without reheating during the process, and in such manner that the head of the bolt is more firmly united with the shank than in such bolts heretofore made by machinery.

Prior to the date of our invention sqnare-neckcd bolts with broad heads have been made by subjecting round rods of lrron to the operation of dies and an upsetting tool, by means of which a portion of the length of the rod was upset, and thus formed into a cylinder of larger diameter than that of the original rod, as a preliminary operation. This rod, thus increased in thickness, was then operated upon by other dies and af header, which swaged this cylinder of larger diameter into a four-sided prism, and also formed the head. In performing this operation it was necessary to reheat the blank after the large cylinder had been formed upon it, and the head that was formed was liable to crack at its junction with the square ofthe bolt. v

In our mode of forming bolts the heated rods are first, by means of dies and a header, struck up at the same operation into thc form substantially as represented in iig. 5,\the characteristics of that form being that part of the rod is swelled and enlarged, as at f, and that a head is formed thereon containing metal sucient, or nearly so, to form the head of thel finished bolt, such head being higher and smaller in diameter than that of the finished bolt. Dies with cavities like a a, hnd a header, c, will perform this operation if used as dies for making spikes and bolts usually are. The bolt'in this form, and without reheating, is, by means of other dies and another header, struck up into the desired form, (fig. 4,) the square part of the bolt, or the neck thereof at e, being formed by squeezing the swell f in directions at right angles to the axis of the rod, or nearly so, and the head being formed by compressing the preliminary or rudimentary head, and, if' desired, a portion of the swell while the square neck is held in dies. Dies with cavities like c c, and a header, d, will perform this operation upon the preliminary form when held so as to be properly gripcd and acted upon by them. These dies and headers for the primary and final operations should be in close proximity to each other, and the most convenient construction in practice is to form the four cavities in two pieces of metal, as represented in g. 5. Any proper means may be employed for supporting, opening, and shutting the' dies, and holding them closed, and the headers may be supported and actuated in any proper manner, our invention being in the mode or process of forming the bolt, and not in the mechanical devices by aid of which such forming may be accomplished. In order, however, that there may be no doubt as to the means we employ in performing our invention, we have represented a. machine used by us at figs. l and 2, in which-g is the stock of the stationary dies, h the stock of the moving dies oscillating upon a pivot or airis at z', and j the stock carrying the two headers, actuated by a cam, le, upon the main shaft Z of' the machine, and retarded by a spring, c, attached to a tail or rod, jl, attached to thc header-stock.

The stock lz is caused to m'ovc away from 'and towards the stationary die-stock by a. cam on the main shaft acting upon a lever, g, pivoted at 1', which lever is, by means of' a universal link, caused to actuate the stock L through the agency of a tail-piece, s, attached thereto. A moving shear-blade, to cut the bolts eti` of the rods when they are finished, is indicated'at t. i

We do not claim the method ot making square-necked bolts for which Letters Patent were granted to W. J. Lewis, April 4,1865, and admit that our method comprehends his method of manufacture; buteur method includes the formation of the rudimentary head, which his does not, and also makes a better bolt, and

saves the expense of reheatng, which in his mode must be preformed after the preliminary and prior to the final operation.

We claim as our invention- The tn cthogl, substantially as herein described, of making bolts with heads and square necks; such method consising in enlarging or swelling that part of thc -rod which is to form tho noch, and :it the saine operation Forming a rudimentary or preliminary head thereon, and subsequently forming tho square neck by squeezing, and the finished head by compression, the whole modo of manufacture being substantially as described.

SAMUEL FmsIE,

ANDREW S. UPSON.

Witnesses:

S. N. WADswonTH, C. W. ROOT. 

